/*
 * uxsftp.c: the Unix-specific parts of PSFTP and PSCP.
 */

#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <utime.h>
#include <errno.h>
#include <assert.h>
#include <glob.h>
#ifndef HAVE_NO_SYS_SELECT_H
#include <sys/select.h>
#endif

#include "putty.h"
#include "ssh.h"
#include "psftp.h"
#include "int64.h"

/*
 * In PSFTP our selects are synchronous, so these functions are
 * empty stubs.
 */
uxsel_id *uxsel_input_add(int fd, int rwx)
{
  return NULL;
}
void uxsel_input_remove(uxsel_id *id)
{
}

char *x_get_default(const char *key)
{
  return NULL; /* this is a stub */
}

void platform_get_x11_auth(struct X11Display *display, Conf *conf)
{
  /* Do nothing, therefore no auth. */
}
const int platform_uses_x11_unix_by_default = TRUE;

/*
 * Default settings that are specific to PSFTP.
 */
char *platform_default_s(const char *name)
{
  return NULL;
}

int platform_default_i(const char *name, int def)
{
  return def;
}

FontSpec *platform_default_fontspec(const char *name)
{
  return fontspec_new("");
}

Filename *platform_default_filename(const char *name)
{
  if (!strcmp(name, "LogFileName"))
    return filename_from_str("putty.log");
  else
    return filename_from_str("");
}

char *get_ttymode(void *frontend, const char *mode)
{
  return NULL;
}

int get_userpass_input(prompts_t *p, const unsigned char *in, int inlen)
{
  int ret;
  ret = cmdline_get_passwd_input(p, in, inlen);
  if (ret == -1)
    ret = console_get_userpass_input(p, in, inlen);
  return ret;
}

/*
 * Set local current directory. Returns NULL on success, or else an
 * error message which must be freed after printing.
 */
char *psftp_lcd(char *dir)
{
  if (chdir(dir) < 0)
    return dupprintf("%s: chdir: %s", dir, strerror(errno));
  else
    return NULL;
}

/*
 * Get local current directory. Returns a string which must be
 * freed.
 */
char *psftp_getcwd(void)
{
  char *buffer, *ret;
  int size = 256;

  buffer = snewn(size, char);
  while (1) {
    ret = getcwd(buffer, size);
    if (ret != NULL)
      return ret;
    if (errno != ERANGE) {
      sfree(buffer);
      return dupprintf("[cwd unavailable: %s]", strerror(errno));
    }
    /*
     * Otherwise, ERANGE was returned, meaning the buffer
     * wasn't big enough.
     */
    size = size * 3 / 2;
    buffer = sresize(buffer, size, char);
  }
}

struct RFile {
  int fd;
};

RFile *open_existing_file(const char *name,
                          uint64 *size,
                          unsigned long *mtime,
                          unsigned long *atime,
                          long *perms)
{
  int fd;
  RFile *ret;

  fd = open(name, O_RDONLY);
  if (fd < 0)
    return NULL;

  ret = snew(RFile);
  ret->fd = fd;

  if (size || mtime || atime || perms) {
    struct stat statbuf;
    if (fstat(fd, &statbuf) < 0) {
      fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
      memset(&statbuf, 0, sizeof(statbuf));
    }

    if (size)
      *size = uint64_make((statbuf.st_size >> 16) >> 16, statbuf.st_size);

    if (mtime)
      *mtime = statbuf.st_mtime;

    if (atime)
      *atime = statbuf.st_atime;

    if (perms)
      *perms = statbuf.st_mode;
  }

  return ret;
}

int read_from_file(RFile *f, void *buffer, int length)
{
  return read(f->fd, buffer, length);
}

void close_rfile(RFile *f)
{
  close(f->fd);
  sfree(f);
}

struct WFile {
  int fd;
  char *name;
};

WFile *open_new_file(const char *name, long perms)
{
  int fd;
  WFile *ret;

  fd = open(name, O_CREAT | O_TRUNC | O_WRONLY, (mode_t)(perms ? perms : 0666));
  if (fd < 0)
    return NULL;

  ret = snew(WFile);
  ret->fd = fd;
  ret->name = dupstr(name);

  return ret;
}

WFile *open_existing_wfile(const char *name, uint64 *size)
{
  int fd;
  WFile *ret;

  fd = open(name, O_APPEND | O_WRONLY);
  if (fd < 0)
    return NULL;

  ret = snew(WFile);
  ret->fd = fd;
  ret->name = dupstr(name);

  if (size) {
    struct stat statbuf;
    if (fstat(fd, &statbuf) < 0) {
      fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
      memset(&statbuf, 0, sizeof(statbuf));
    }

    *size = uint64_make((statbuf.st_size >> 16) >> 16, statbuf.st_size);
  }

  return ret;
}

int write_to_file(WFile *f, void *buffer, int length)
{
  char *p = (char *)buffer;
  int so_far = 0;

  /* Keep trying until we've really written as much as we can. */
  while (length > 0) {
    int ret = write(f->fd, p, length);

    if (ret < 0)
      return ret;

    if (ret == 0)
      break;

    p += ret;
    length -= ret;
    so_far += ret;
  }

  return so_far;
}

void set_file_times(WFile *f, unsigned long mtime, unsigned long atime)
{
  struct utimbuf ut;

  ut.actime = atime;
  ut.modtime = mtime;

  utime(f->name, &ut);
}

/* Closes and frees the WFile */
void close_wfile(WFile *f)
{
  close(f->fd);
  sfree(f->name);
  sfree(f);
}

/* Seek offset bytes through file, from whence, where whence is
   FROM_START, FROM_CURRENT, or FROM_END */
int seek_file(WFile *f, uint64 offset, int whence)
{
  off_t fileofft;
  int lseek_whence;

  fileofft = (((off_t)offset.hi << 16) << 16) + offset.lo;

  switch (whence) {
  case FROM_START:
    lseek_whence = SEEK_SET;
    break;
  case FROM_CURRENT:
    lseek_whence = SEEK_CUR;
    break;
  case FROM_END:
    lseek_whence = SEEK_END;
    break;
  default:
    return -1;
  }

  return lseek(f->fd, fileofft, lseek_whence) >= 0 ? 0 : -1;
}

uint64 get_file_posn(WFile *f)
{
  off_t fileofft;
  uint64 ret;

  fileofft = lseek(f->fd, (off_t)0, SEEK_CUR);

  ret = uint64_make((fileofft >> 16) >> 16, fileofft);

  return ret;
}

int file_type(const char *name)
{
  struct stat statbuf;

  if (stat(name, &statbuf) < 0) {
    if (errno != ENOENT)
      fprintf(stderr, "%s: stat: %s\n", name, strerror(errno));
    return FILE_TYPE_NONEXISTENT;
  }

  if (S_ISREG(statbuf.st_mode))
    return FILE_TYPE_FILE;

  if (S_ISDIR(statbuf.st_mode))
    return FILE_TYPE_DIRECTORY;

  return FILE_TYPE_WEIRD;
}

struct DirHandle {
  DIR *dir;
};

DirHandle *open_directory(const char *name)
{
  DIR *dir;
  DirHandle *ret;

  dir = opendir(name);
  if (!dir)
    return NULL;

  ret = snew(DirHandle);
  ret->dir = dir;
  return ret;
}

char *read_filename(DirHandle *dir)
{
  struct dirent *de;

  do {
    de = readdir(dir->dir);
    if (de == NULL)
      return NULL;
  } while ((de->d_name[0] == '.' &&
            (de->d_name[1] == '\0' ||
             (de->d_name[1] == '.' && de->d_name[2] == '\0'))));

  return dupstr(de->d_name);
}

void close_directory(DirHandle *dir)
{
  closedir(dir->dir);
  sfree(dir);
}

int test_wildcard(const char *name, int cmdline)
{
  struct stat statbuf;

  if (stat(name, &statbuf) == 0) {
    return WCTYPE_FILENAME;
  } else if (cmdline) {
    /*
     * On Unix, we never need to parse wildcards coming from
     * the command line, because the shell will have expanded
     * them into a filename list already.
     */
    return WCTYPE_NONEXISTENT;
  } else {
    glob_t globbed;
    int ret = WCTYPE_NONEXISTENT;

    if (glob(name, GLOB_ERR, NULL, &globbed) == 0) {
      if (globbed.gl_pathc > 0)
        ret = WCTYPE_WILDCARD;
      globfree(&globbed);
    }

    return ret;
  }
}

/*
 * Actually return matching file names for a local wildcard.
 */
struct WildcardMatcher {
  glob_t globbed;
  int i;
};
WildcardMatcher *begin_wildcard_matching(const char *name)
{
  WildcardMatcher *ret = snew(WildcardMatcher);

  if (glob(name, 0, NULL, &ret->globbed) < 0) {
    sfree(ret);
    return NULL;
  }

  ret->i = 0;

  return ret;
}
char *wildcard_get_filename(WildcardMatcher *dir)
{
  if (dir->i < dir->globbed.gl_pathc) {
    return dupstr(dir->globbed.gl_pathv[dir->i++]);
  } else
    return NULL;
}
void finish_wildcard_matching(WildcardMatcher *dir)
{
  globfree(&dir->globbed);
  sfree(dir);
}

char *stripslashes(const char *str, int local)
{
  char *p;

  /*
   * On Unix, we do the same thing regardless of the 'local'
   * parameter.
   */
  p = strrchr(str, '/');
  if (p)
    str = p + 1;

  return (char *)str;
}

int vet_filename(const char *name)
{
  if (strchr(name, '/'))
    return FALSE;

  if (name[0] == '.' && (!name[1] || (name[1] == '.' && !name[2])))
    return FALSE;

  return TRUE;
}

int create_directory(const char *name)
{
  return mkdir(name, 0777) == 0;
}

char *dir_file_cat(const char *dir, const char *file)
{
  return dupcat(dir, "/", file, NULL);
}

/*
 * Do a select() between all currently active network fds and
 * optionally stdin.
 */
static int ssh_sftp_do_select(int include_stdin, int no_fds_ok)
{
  fd_set rset, wset, xset;
  int i, fdcount, fdsize, *fdlist;
  int fd, fdstate, rwx, ret, maxfd;
  unsigned long now = GETTICKCOUNT();
  unsigned long next;

  fdlist = NULL;
  fdcount = fdsize = 0;

  do {

    /* Count the currently active fds. */
    i = 0;
    for (fd = first_fd(&fdstate, &rwx); fd >= 0; fd = next_fd(&fdstate, &rwx))
      i++;

    if (i < 1 && !no_fds_ok)
      return -1; /* doom */

    /* Expand the fdlist buffer if necessary. */
    if (i > fdsize) {
      fdsize = i + 16;
      fdlist = sresize(fdlist, fdsize, int);
    }

    FD_ZERO(&rset);
    FD_ZERO(&wset);
    FD_ZERO(&xset);
    maxfd = 0;

    /*
     * Add all currently open fds to the select sets, and store
     * them in fdlist as well.
     */
    fdcount = 0;
    for (fd = first_fd(&fdstate, &rwx); fd >= 0; fd = next_fd(&fdstate, &rwx)) {
      fdlist[fdcount++] = fd;
      if (rwx & 1)
        FD_SET_MAX(fd, maxfd, rset);
      if (rwx & 2)
        FD_SET_MAX(fd, maxfd, wset);
      if (rwx & 4)
        FD_SET_MAX(fd, maxfd, xset);
    }

    if (include_stdin)
      FD_SET_MAX(0, maxfd, rset);

    if (toplevel_callback_pending()) {
      struct timeval tv;
      tv.tv_sec = 0;
      tv.tv_usec = 0;
      ret = select(maxfd, &rset, &wset, &xset, &tv);
      if (ret == 0)
        run_toplevel_callbacks();
    } else if (run_timers(now, &next)) {
      do {
        unsigned long then;
        long ticks;
        struct timeval tv;

        then = now;
        now = GETTICKCOUNT();
        if (now - then > next - then)
          ticks = 0;
        else
          ticks = next - now;
        tv.tv_sec = ticks / 1000;
        tv.tv_usec = ticks % 1000 * 1000;
        ret = select(maxfd, &rset, &wset, &xset, &tv);
        if (ret == 0)
          now = next;
        else
          now = GETTICKCOUNT();
      } while (ret < 0 && errno == EINTR);
    } else {
      do {
        ret = select(maxfd, &rset, &wset, &xset, NULL);
      } while (ret < 0 && errno == EINTR);
    }
  } while (ret == 0);

  if (ret < 0) {
    perror("select");
    exit(1);
  }

  for (i = 0; i < fdcount; i++) {
    fd = fdlist[i];
    /*
     * We must process exceptional notifications before
     * ordinary readability ones, or we may go straight
     * past the urgent marker.
     */
    if (FD_ISSET(fd, &xset))
      select_result(fd, 4);
    if (FD_ISSET(fd, &rset))
      select_result(fd, 1);
    if (FD_ISSET(fd, &wset))
      select_result(fd, 2);
  }

  sfree(fdlist);

  run_toplevel_callbacks();

  return FD_ISSET(0, &rset) ? 1 : 0;
}

/*
 * Wait for some network data and process it.
 */
int ssh_sftp_loop_iteration(void)
{
  return ssh_sftp_do_select(FALSE, FALSE);
}

/*
 * Read a PSFTP command line from stdin.
 */
char *ssh_sftp_get_cmdline(const char *prompt, int no_fds_ok)
{
  char *buf;
  int buflen, bufsize, ret;

  fputs(prompt, stdout);
  fflush(stdout);

  buf = NULL;
  buflen = bufsize = 0;

  while (1) {
    ret = ssh_sftp_do_select(TRUE, no_fds_ok);
    if (ret < 0) {
      printf("connection died\n");
      sfree(buf);
      return NULL; /* woop woop */
    }
    if (ret > 0) {
      if (buflen >= bufsize) {
        bufsize = buflen + 512;
        buf = sresize(buf, bufsize, char);
      }
      ret = read(0, buf + buflen, 1);
      if (ret < 0) {
        perror("read");
        sfree(buf);
        return NULL;
      }
      if (ret == 0) {
        /* eof on stdin; no error, but no answer either */
        sfree(buf);
        return NULL;
      }

      if (buf[buflen++] == '\n') {
        /* we have a full line */
        return buf;
      }
    }
  }
}

void frontend_net_error_pending(void)
{
}

void platform_psftp_pre_conn_setup(void)
{
}

const int buildinfo_gtk_relevant = FALSE;

/*
 * Main program: do platform-specific initialisation and then call
 * psftp_main().
 */
int main(int argc, char *argv[])
{
  uxsel_init();
  return psftp_main(argc, argv);
}
